Yes thats a bug in the game - I don't have STCC 2, but have experienced this whilst using freetrack in some, but not all of the cars, in the Race Series. It can only be seen when your seat is quite far back and your head is also back when you look to your extreme left or right using headtracking software, it is quite weird and can be very distracting when you first experience it though can't it!! In some of the cars you'll find the back half is rendered, unfortunately looking around to admire the inside of the back half of the cars usually ends up with the front half bouncing off a wall. . . . .